efficient viscose rayon production (Christoffersson et al., 2002; Engström et al., 2006; Fischer et al., 2009; Gehmayr et al., 2012; Henriksson et al., 2005; Ibarra et al., 2010; Kvarnlöf et al., 2006).<br>A unique advantage associated with high accessibility and reactivity is that the required amount of carbon disulfide can be reduced, allowing for low toxic sulfur emissions and cost savings in the manufacturing process (Kvarnlöf et al., 2007). In addition to the pre-hydrolysis kraft process, the dissolving pulp derived from woody materials is also commercially produced by the sulfite process (Sixta et al., 2013). Compared with the sulfite-based dissolving pulp, the kraft-based dissolving pulp has higher a-cellulose content but lower reactivity; on the other hand, the reactivity of hardwood kraft-based dissolving pulp is usually lower than that of softwood kraft-based dissolving pulp (Ibarra et al., 2010; Strunk et al., 2011). In this sense, it would be desirable to enhance the accessibility and reactivity of hardwood kraft-based dissolving pulp.<br>Differing from previous reports in which the sulfite-based dissolving pulps were pretreated with cellulose enzyme, in the present study, the concept of cellulase treatment was applied to<br>hardwood kraft-based dissolving pulp, and its effect on the enhancement of accessibility and reactivity was studied. Although the cellulase pretreatment can be used for pulping (Maijala et al.,2008), refining (Tang et al., 2012), and deinking (Vyas and Lachke,2003) in the pulp and paper industry, the hypothesis of the present study is that the cellulase treatment can open the fiber structure, and increase the porosity, hence, improving the accessibility and reactivity during the viscose rayon process. ...
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